Ir-Catalyzed Reversible Acceptorless Dehydrogenation/Hydrogenation of N-Substituted and Unsubstituted Heterocycles Enabled by a Polymer-Cross-Linking Bisphosphine
作者:Deliang Zhang、Tomohiro Iwai、Masaya Sawamura
DOI:10.1021/acs.orglett.0c01905
日期:2020.7.2
Notably, this protocol is applicable to the dehydrogenation of N-substituted indoline derivatives with various N-substituents with different electronic and steric natures. A reaction pathway involving oxidative addition of an N-adjacent C(sp3)–H bond to a bisphosphine-coordinated Ir(I) center is proposed for the dehydrogenation of N-substituted substrates.
Pd-Catalyzed Dearomative Carboxylation of Indolylmethanol Derivatives
作者:Tsuyoshi Mita、Sho Ishii、Yuki Higuchi、Yoshihiro Sato
DOI:10.1021/acs.orglett.8b03337
日期:2018.12.7
By using a new catalytic system (PdCl2[P(n-Bu)(3)](2) in combination with ZnEt2), various 3-indolylmethanol derivatives were successfully carboxylated with CO2 (1 atm) via dearomatization of the indole nucleus, affording 3-methyleneindoline-2-carboxylates. In contrast, carboxylation of 2-indolylmethanol derivatives afforded unexpected doubly carboxylated products, which are useful synthetic precursors for biologically active compounds.
Indoles Synthesized from Amines via Copper Catalysis
作者:Ronald Besandre、Miguel Jaimes、Jeremy A. May
DOI:10.1021/ol400444g
日期:2013.4.5
N-Substituted indoles are synthesized from primary amines through a tandem reaction sequence. Initial condensation of the amine with an alpha-(o-haloaryl)ketone or aldehyde is followed by intramolecular aryl amination catalyzed by CuI. A variety of anilines and alkyl amines, including those with significant steric demands, are converted to indoles in high yields and with varying indole substitution.
Synthesis of <i>meta</i>-(Indol-3-yl)phenols from Indoles and Cyclohexenone via Palladium(II)-Catalyzed Oxidative Heck Reaction and Dehydrogenative Aromatization in a One-Step Sequence
作者:Seung Hwan Son、Jeong-Won Shin、Hyuck-Jae Won、Hyung-Seok Yoo、Yang Yil Cho、Soo Lim Kim、Yoon Hu Jang、Boyoung Y. Park、Nam-Jung Kim
DOI:10.1021/acs.orglett.1c02679
日期:2021.10.1
with a wide substrate scope (a total of 25 compounds) via a palladium(II)-catalyzed oxidative Heckreaction and dehydrogenative aromatization in a one-step sequence is reported. This methodology affords a novel route for the privileged structures that are challenging to access via a direct link between indole and phenol, in a highly efficient and atom-economical manner.
据报道,通过钯 (II) 催化的氧化 Heck 反应和脱氢芳构化以一步顺序轻松构建具有广泛底物范围(总共 25 种化合物)的间-(吲哚-3-基)苯酚骨架。这种方法为通过吲哚和苯酚之间的直接链接以高效和原子经济的方式难以访问的特权结构提供了一种新途径。
Frustrated Lewis Pair Catalyzed Dehydrogenative Oxidation of Indolines and Other Heterocycles
作者:Alexander F. G. Maier、Sebastian Tussing、Tobias Schneider、Ulrich Flörke、Zheng-Wang Qu、Stefan Grimme、Jan Paradies
DOI:10.1002/anie.201606426
日期:2016.9.26
An acceptorless dehydrogenation of heterocyclescatalyzed by frustrated Lewis pairs (FLPs) was developed. Oxidation with concomitant liberation of molecular hydrogen proceeded in high to excellent yields for N‐protected indolines as well as four other substrate classes. The mechanism of this unprecedented FLP‐catalyzed reaction was investigated by mechanistic studies, characterization of reaction intermediates